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LibraryElementBuilder.buildLibrary2() always sets it, so there's no reason for the caller to set it as well. R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//839463003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42798 260f80e4-7a28-3924-810f-c04153c831b5